<template>
  <div class="login_container">
    <div class="login_box">
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="Login" />
      </div>
      <el-form
        label-width="0px"
        class="login_form"
        :model="loginFrom"
        :rules="loginFromRules"
        ref="loginFromRef"
      >
        <!-- 账号 -->
        <el-form-item prop="username">
          <el-input
            prefix-icon="el-icon-user"
            v-model="loginFrom.username"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            prefix-icon="el-icon-lock"
            v-model="loginFrom.password"
            type="password"
          ></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btn_position">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginFrom">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 登陆表单数据绑定对象
      loginFrom: {
        username: 'admin',
        password: '123456'
      },
      // 登陆表单验证
      loginFromRules: {
        // 用户名验证规则
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          {
            min: 2,
            max: 10,
            message: '长度在 2 到 10 个字符',
            trigger: 'blur'
          }
        ],
        // 密码验证规则
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          {
            min: 6,
            max: 16,
            message: '长度在 6 到 16 个字符',
            trigger: 'blur'
          }
        ]
      }
    }
  },
  methods: {
    resetLoginFrom () {
      this.$refs.loginFromRef.resetFields()
    },
    login () {
      this.$refs.loginFromRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post('/login', this.loginFrom)
        if (res.meta.status !== 200) {
          return this.$message({
            showClose: true,
            message: '登录失败！',
            type: 'error'
          })
        }
        this.$message({
          showClose: true,
          message: '登录成功！',
          type: 'success'
        })
        // 登陆成功后，将token信息存放到sessionStorage中
        window.sessionStorage.setItem('token', res.data.token)
        // 通过编程式导航跳转到 home 组件
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: rgba(255, 255, 255, 0.6);
  border-radius: 5px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.avatar_box {
  width: 130px;
  height: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 10px #ddd;
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: rgba(255, 255, 255, 0.6);
  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
  }
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
.btn_position {
  display: flex;
  justify-content: flex-end;
}
</style>
